Truing tool



Aug. 19, 1924.- 1,505,210

- c. L. LEE

TRUING- TOOL Filed Jan. 17. 1923 Patented Aug. 19, 1924.

UNITED STATES maant PATENT oFFlcE.

cHAELEs L. LEE, or nAYToN, omo, Assrenon'ro GENERAL ivio'rons RESEARCHcon` PoRATroN, or DAYTON, omo, A ooEroEArioNcE DELAWARE.

TRUIN'G TOOL.

Application filed January l17, 1923'. Serial No. *613,104.

To @ZZ whom t may concern.'

Be it known that I, CHARLES L. LEE, a citizen of the United States ofAmerica, residing at Dayton, county of Montgomery, and State of Ohio,have invented certain new and useful Improvements in Truing Tools, ofwhich the following is a full, clear, and exact description.

This invention relates to Vimprovements in internal combustion engines,and more par ticularly to those of the air cooled type wherein` thecylinder fins are comprised of a soft metal such as copper.

It can be readily appreciated that an en` gine cylinder, having its finsconstructed of copper or other soft metal,-will, in the process ofmanufacture or while in the hands of the user or of a garage repairman,be subjected to having its fins distorted from their normal shape andthus reduceor restrict the flow of cooling air therethrough'.

The present invention, therefore, provides means for truing or ironingthe fins back to their normal shape.

Further objects and advantages of the present invention will be apparentfrom the following description, reference being had to the accompanyingdrawings, wherein:

Fig. 1 is a perspective view of an engine cylinder of the air cooledtype, showing the application of the truing tool to the fins.

Fig. 2 is a perspective view of the truing tool.

Fig. 3 is a bottom shown in Fig. 2.

The present invention contemplates an operating means to which areattached truing members for engaging simultaneously both the inner andouter surfaces of a fin, preferably of the loop type, although theinvention may be adapted for use with other types of fins equally well.These truing members are provided with substantially plane surfaces, sothat when brought into contact with the surfaces of the lin loop theyrender those surfaces substantially plane. The truing members are`preferably constructed as to be resilient with respect to each other. Itcan readily be seen that if there were not some resiliency between thesemembers, damage might occur to the loop when the truing device isbrought into use, especially if the loop is constructed of soft metalsuch as copper. It is not necessary that this truing device shouldrender the plan view of the tool loop substantially plane inonefoperation. The loop may be trued up gradually so as to preventserious injury to the same.

Referring to the drawings, and more particularly to Fig. l, the enginecylinder 20 has the fin loops 2l attached thereto in :any suitablemanner, such as disclosed in the copending application of Charles F.Kettering, Serial No. 514,014, filed November 9, 1921. In Fig. 2 theframe 22 has attached at its lower extremity the ironing fingers 23 inany suitable manner, such as by riveting or welding. The fingers 23 aresomewhat resilient with respect to frame 22 and pilot 27 and frame 22and 27 are somewhat resilient withv respect to the operating means so asto yield slightly with respect to the fin. These ngers 23 are slightlycurved, as at the point 23, to permit the same.l to gradually come intocontact with the outer surface of the fin loop. This construction makesit easier for the operator to'start the truing tool on its downward pathfor the truing operation. At the opposite end of the. frame 22 there areattached the straps 24, between which is located the handle 25. Thestrap members are so formed as to provide a shoulder 26. rlhe pilot 27is attached to the straps 24 through means of rivets 28, or by welding,and has a cross section adapted to iit on the inside of the fin loops21.

The operation of the truing tool is as fol-` lows:

The operator grasps the device by the handle' 25 and inserts the pilot27 on the inside of the fin loop 2l, the ironing lingers travelling onthe outside of the fin loop. It

will be noted that the pilot travels in advance of the ironing fingers,thus preparing the work to be done -by the ironing fingers. The pilot isthen forced downward until its movement is stopped by the abutment ofthe shoulder 26 against the top of the cylinder. The operator thencontinues to move the truing tool up and down in a vertical directionuntil the surfaces of iin loop has been completely ironed out by theironing fingers and rendered substantially plane. The resiliency of thetruing elements is suiiicient to permit the ironing or truing operationwithout damage to the fin material especially when thin soft metal isused.

While the method herein described, and the form of apparatus `forcarryingthis method into effect, constitute a preferred embodiment ofthe invention, it is to be understood that the invention s not limitedto this precise method and form of' apparatus, and that changes may lbemade in either Without departing from the scope of the invention whichis defined in the appended claims.

`What I claim is as follows: n y

l. In a device for truing fins, the combination with operating means, ofmemlbers attached to said means, said members providing substantiallyplane surfaces adapted to engage simultaneously upon opposite sides of afin in order to render the fin su-bstantially plane.

2. In a device yfor truing fin loops, the combination with operatingmeans, of means for 'engaging the interior surface of the loop, andmeans for engaging theouter surface of the loop simultaneously Withengagement of the inner surface.

3. In a device for truing fin loops, the combination With operatingmeans, of a pilot member adapted to enter a fin loop and having` planesurfaces adapted to engage the interior surface of the loop, and membersvextending' adjacent the pilot member and spaced therefrom for pressingthe fin loop againstthe pilot member.

et. Ina device for truing fins, the combination with operating means, ofmembers mounted on'said operating means and having truing surfacesadapted to be resilient With respectl toueach other so as to yield withrespect to the fin.

5. Ina device for truing fin loops, the

combination with operating means, of apilot member attached thereto andadapted to fit Within a fin loop and engage the inner surface thereof,and ironing fingers extending adjacent the pilot member but spacedtherefrom for pressing the exterior surface of the fin loopv against thepilot member inorder to render the n loop lsubstantially plane.

6. Ina devicek for truing fin loops, the

signature. f. Y f

CHAR-LES L. LEE. vWitnesses :l

IVALTER IV. RIEDEL, WVM. P. P'Asoo.

